A couple years ago I stumbled in to "lucid dreaming" by accident.  I'm an engineering type and don't have much truck for kooky new age stuff.  But as it turns out lucid dreaming is very simple and sensible.  A lucid dream is just a dream in which you are conscious that you're dreaming.  That's all there is to it . . . a dream in which you are conscious that you're dreaming.  Well, as it turns out it's an ability that can be improved if one wants to do the work.  There are some excellent practical how-to books available at Amazon, particularly "Exploring the World of Lucid Dreaming".  It can open new worlds to the practitioner.  I wish I had learned about it thirty years ago.  There are also a few books where the authors go off on oddball new-agey stuff, which is fine if that's what you're after, but don't let those scare you off.  Lucid dreaming is truly a wonderful experience and I recommend it highly to anyone who might be interested.